Tectonic Plates

2. reptile fossil found in South America and Africa
4. earths biggest plate
5. is a famous divergent boundary
8. this is formed when two plates crash into each other and crumple
10. fossil plant found in, Africa, Australia, India, South America, and Antartica
11. this rigid layer is about 100m thick genrally is less dense than material underneath
13. earths crust and part of the upper mantle are broken into sections
15. a version of this same process, occurring in the mantle, is thought to be the force behind plate tectonics
17. suggested the theory of seafloor spreading
18. plastic like layer of the mantle
19. mountains similar to those in Greenland and Western Europe

1. __________Boundary; two plates are moving together, sometimes plates subduct under each other
3. Hess's theory that new seafloor is formed when magma is forced upward toward the surface at the mid-ocean ridge
6. evidence that africa was once cold
7. plates flout on the plastic like layer of the ______
9. _________Boundary; two plates slide past each other, can move in opposite directions, can move in same direction at different rates
12. Wegner's name for one large landmass
14. the plastic like layer below the lithosphere
15. slow movement of continents
16. earthquakes are very common in this state